Drilling mechanism



DRILLING MECHANISM Filed Dec. 13, 1924 24 x '22 5 25 -16 -14 I k M m 20g 19 Patented June 3, 1930 UNITED STATES PATENT OFFICE EDWARD EARL MILLER, OF PARIS, FRANCE, ASSIGNOR TO SULLIVAN MACHINERY I COMPANY, A CORPORATION OF MASSACHUSETTS DRILLING MECHANISM Application filed December 13, 1924. Serial No. 755,714.

My invention relates to drilling mechanisms.

An object of my invention is to provide an improved drilling mechanism and more particularly an improved drilling mechanism of the hand hammer type. Another object of my invention is to provide an improved drilling mechanism of the hand hammer type which is provided with improved controlling means therefor. Still another object of my invention is to provide an improved control ling mechanism for a drilling mechanism of the hand hammer type which may be readily operated from the supporting handle of the drill. A still further object of my invention is to provide improved means for controlling the motive fluid supply to a drilling mechanism of the hand hammer type which enables the operator to control the motive fluid supply from the grasping handle of the drill by a single hand without removing the hand therefrom. These and other objects and advantages of my invention will, however, hereinafter more fully appear.

In the accompanying drawings I have shown for purposes of illustration one form which my invention may assume in practice.

In these drawings,

Fig. 1 is an elevational view, partially in central longitudinal section, of a drilling mechanism in which my improved controlling mechanism is incorporated.

Fig. 2 is a central longitudinal sectional view taken substantially on line 2-2 of 1, the view being shown partially in elevation.

In this illustrated form of my invention I have shown a drilling mechanism generally designated 1 which is of the hand hammer valved percussive type, but which may be of any other suitable type, provided with a motor cylinder 2 and a valve chest 3 in which a valve, not shown, is disposed which distributes motive fluid to and from the cylinder 2 in a well known manner. The forward end of the cylinder 2 is provided with a head member l and a chuck housing 1 in which a drill steel 5 is suitably supported. The rear end of the cylinder 2 is provided with a combined head and handle carrying member 6 which has upwardly projecting spaced arms 7 formed thereon. The handle of the drilling mechanism extends transversely thereof and is composed of laterally projecting circular grip portions 8 which are held in position relative to the arms 7 by means of a transversely extending bolt 9. Motive fluid is adapted to be admitted to the supply passage 10 of the drilling motor through a hose connection 11 which is threadedly secured at 12, in a valve casing 13. This valve casing is threadedly secured at 14, to a gland plug 15 which is in turn threadedly secured at 16, in the valve chest 8. The valve casing 13 is provided with a septum 17 in which a circular valve seat 18 is formed with which an end seating valve member 19 is adapted to cooperate. The valve 19 is normally automatically held on the seat 18 by means of a coiled spring 20 interposed between the lower surface of the valve and an adjustable plug or follower member 21 threadedly secured to the bottom of the valve casing in the usual manner. The valve 19 isprovided with an elongated operating rod or stem 22 which is freely reciprocable in a bore 23 formed in a sleeve member 24 which is threadedly secured, as at 25, at its lower end in the valve casing 13. This sleeve 24 projects upwardly through openings 26 and 27 formed in the hollow grip 8, which in this case may be formed of a suitable metal material, to a point adjacent the upper surface thereof. The upper end of the stem 22 is provided. with an operating portion or push button 28 secured thereto in any suitablemanner.

In the use of my improved controlling mechanism it will be notedthat the operator grasps the grips 8 of the supporting handle and supports the drill steel 5 in the desired position relative to the working face ofthe material to be drilled. Simultaneously the hand of the operator forces the push button 28 downwardly sliding the stem 22 in the bore 23 formed in the sleeve 24 and thus unseating the valve 19 and permitting motive fluid to pass from the supply connection 11 through the gland plug 15 into the motive fluid supply passage 10 of the drilling motor consequently causing the drill steel to be actuated and drilling the hole, the operator guiding the drill steel as the hole deepens. When the hole is completed the operator removes his grasp from the handle 8 and the push button 28 consequently causing the valve 19 to, be automatically seated by means of the coiled spring 20, and cutting off the motive fluid supply to and stopping the operation of the drilling motor.

As a result of my improvement it will be noted that improved controlling means are provided for the drilling mechanism which may be operated from the grasping or supporting handle enabling the operator to control the drill by the use of but a single hand without removing the hand from the handle. It will be further noted that improved controlling means is provided for the motive fluid supply of the drilling mechanism which is of exceedingly simple and compact form which may be applied to a standard drilling mechanism with a minimum of change and expense.

While I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes oi": illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

hat I claim as new and desire to secure by Letters Patent is:

1. A drilling mechanism comprising a fluid actuated drilling motor adapted to actuate a tool, a T-shaped handle attached to said mechanism at the rear end of said motor and having oppositely projecting grasping portions, a throttle valve carried at the side of said motor for controlling the supply of motive fluid in the motor, a valve operating element extending longitudinally rearwardly from said valve through one of said grasping portions at a point adjacent the middle of said 48, portion, a push button on the end of said element adapted to be grasped automatically by the hand of an operator when said handles are grasped to push the drilling mechanism toward the work, and means for auto matically returning said valve to closed position when said push button is released as when the drilling mechanism is lifted from the work.

2. The combination with a drilling mechanism having a fluid actuated drilling motor adapted to actuate a tool, a handle mounted at the rear end of said motor having oppositely extending manual grasping portions, and a fluid supply connection at the side of said motor, of a throttle valve attachment for said mechanism comprising a valve casing havingmeans for connection to said fluid supply connection and to a, source of pressure fluid, a valve in said casing, a valve operating element projecting rearwardly from said 

